Blowpipe



W. J. LEIGHTY AND l. ALLISON.

BLOWPIPE.

APPLlCATlON FILED MAR. 29. 1919.

Patented Mar. 14, 1922.

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UNITED STATES PATENT oFFicE.

WILLIAM J'. LEIGHTY, OF CHICAGO, AND ISAIAH ALLISON, OF DOWNERS' GROVE,

. ILLINOIS. l i

BLowrrrn Specication of Letters Patent. Patented Liar,` 14, 1922,

Application filed March 29, 1919. Serial No. 286,074.

To all whom it lmay concern.'

Be it known that we,'W1 LLIAM J. LEIGHTY and lsAIAH ALLrsoN, citizens of the United States, and residents of Chicago and Downers Grove, respectively, inthe county of Cook and-State of Illinois, have invented certain new and useful Improvements in Blowpipes, of which the following is a description, reference being had to the accompanyin drawing, which forms a partof our speci cation.

Our invention relates more particularly to an Oxy-acetylene blowpipe adapted for use either as a cutting blowpipe or as a welding blowpipe, by the mere substitution or interchange of the tips or nozzles; such interchange-being readily accomplished and gastight connections provided because of the simple construction and arrangement.

Another object of our invention is to provide a blowpipe 'with a mixing chamber of the injector type located at a point as far removed from the iame as possible; that is to say, a mixing chamber located in the rear endv of the handle of the torch, whereby al normal or neutral mixture of the combusti'- ble gases is ensured, regardless of the length' or duration of time of continuous welding or cutting operation of the torch. l

A further object of our invention is to provide means whereby the combustible mix'- ture of gases will be kept cool and therefore protected from the heat of the ame while vlsaid gases are traveling from the mixing chamber in the handle portion of the blowpipe to the delivery end or tip of the nozzle.

A further object of our invention is to provide a blowpipe having a head provided with a plurality of passages and adapted to receive a cutting tip or nozzle whereby' a multi-jetted pre-heating flame is provided about a single jet of oxygen when the blowpipe is intended for cutting purposes; said tip being readily removable and easily replaced by a tip constructed so as to effectually close.- the passage in the head `for the oxygen and thus provide a neutral welding flame that will be 4positively maintained, re-

gardless of whether the valve which controls the oxygen passage. in the blowpipe is fluid or gas-tight.

Another object of our invention is to pro-- wide range of usefulness. The above enumerated advantages, as well as others inherent in the construction, together with the object-s of the invention, will be more readily comprehended 'from the following detailed description of the. accompanying drawing wherein Figure l is a longitudinal detail sectional view of our improved blowpipe provided with a cutting tip or nozzle; the view being taken' substantially on the line A--A of Figure 2 and looking in the direction of the arrows.

Figure 2 is a transverse` sectional view taken on the line B-B of Figure 1 looking in the direction of the arrows and disclosing the oxygen inlet or admission valve and inlet stem. l

Figure 3 is ar transverse sectional view taken on the line C-C of Figure 1 looking in the direction of the arrows and disclosing the acetylene or hydrogen admission valve and inlet stem.

Figure 4 is a partial longitudinal sectional View of the rear or handle end of the blowpipe, taken substantially on the same line as igure 1 and disclosing the cutting gas-'control valve in open position. y

Figure 5 is a transverse sectional view taken on the line D-'D of Figure 1 to more clearly'disclosethe arrangement of` gas passa es in the cutting tip or nozzle.

*igure 6 is a longitudinal sectional view of the nozzle or tip end of the blow ipe, taken substantially onthe same line as 1gure 1 and'showing the blowpipe provided with a welding tip substituted for the cutting tip' disclosed in Figure l.

Theexemplicaion disclosed in the drawwish to be understood as limiting ourselves to the exact construction disclosed, as the invention may have expression in somewhat different mechanical form without departing from the spirit of the invention. 'In the specific mechanical `expression of the invention, as disclosed in the drawing, the blowpipe comprises a main or body portion 10, which may be in the nature of a suitable casting provided with passages as hereinafter described and also adapted to receive, an outer shell .or cover as at 11. The rear end of the body portion or casting 10 is provided with 'a pairof valve-stems or extensions 12 and 13g-projecting in a suitable angular manner from the rear end of the main or body portion 10 and preferably 'formed integral therewith; and each valvestem or extension 12 and 13 is provided with a suitable inlet stem as at 14 in Figure 1 and at 15 in Figure 2, adapted to receive the end of a hose or conduit leading to the respective gas-supplies; that is, the stem 14 is adapted to be connected with a suitable supply of oxygen while the stem 15 is adapted to be connected with a suitable supply of acetylene or hydro en. The valve-stem 12 is provided with a suitable needle-valve as at 16, see Figure 2, controlled by a suitable hand-wheel 17 the valve 16 being threaded in the valvestem 12, as shown in Fi ure 2 and a gastight connection being e ected by means of a suitable packing-nut 18 shown threaded onto the exterior of steam 12, `whereby a packing-gland 19 is forced into intimate relation with the end of the stem 12 and about the valve 16. The stem 12 is provided with a gas-passage 20 which connects with a gaschamber 2l formed in the rear end of the body ortion or casting 10, see Figure 1; the cham er 21 being closed by means of the closure member or cap 22 which is shown threaded` into the interior of the casting 10 and provided with a flange ada ted to over! lap and abut the end of the castmg as shown at 23 so as to 4eilt'ect a gas-tight connection; the closure member or cap 22 being also shown provided with a wrench-receiving portion or surface at 24 whereby the closure member or cap may be screwed into or out of 'placer l v he body portion or casting 10 is provided withpassages disposed in .a longitudinal manner; and the rear end ofI one of said longitudinal passages is threaded to receive an injector-tube 25 which communicates with the gas-chamber 21. The inner end of the injector-tube 25 is shown threaded toreceive one end ofa combining tube or throat 26` which is aY ertured and constructed to provide a cham er or space about the immeiate tip of injector-tube 25. The end of the passage in the main or body portion 10, ata distance. removed from the threaded end which receives the injector-tube 25, is somewhat enlarged to provide an annular chamber 27.

4The side walls of the combining tube or throat 26, at a point coincident with the tip -mixing chamber or passage 29 leading toward the opposite end 'of the main or body portion 10. The opposite end of mixing chamber 'or assage 29v is provided with a. conduit or tu e 30 shown screwed into place,

while the opposite end of conduit or tube 3() is screwed into a suitable socket or opening in the head 31 which is provided with a passage 32 which communicates with a suitable annular passage or chamber 33. The chamber 33 is formed in head 31 so as to be disposed at the innerend of the tip or nozzle 34. The tip 34 is provided with a plurality of passages 35 which communicate with chamber 33 and terminate at the outer end of the tip 34 in more or less restricted oriices as shown in Figure 5. Thepassages 35 (of which there are a suitable number) are circumferentially disposed about a .central passage 36 formed in the tip or nozzle 34. The passage 36' at' its inner end communicates with a passage 37 formed in the head 31 and the passa e 37 communicates with one end of a conduit or tube 38 concentrically disposed about conduit or tube 30. The other end of conduit 38 is suitably threaded into the main or body portion 10 and conimunicates with an annular space or chamber 39 formed in the body portion or casting 10, as shown in Figure 1; said chamber being disposed about the upper or inner end oi tube 30. The chamber 39 communicatesl with a. longitudinally disposed passage 4() (shown in dotted lines in F igure 1 and in cross-section in Figure 3) and the rear end of passage 40 communicates with a passage 41 which latter communicates with the annular chamber 42, see Figures 1 and 3.

The main body portion or casting 10 is longitudinally cored to receive a housing. 43 which 'has communication by moans ol' suitable ports 44 with the annular chainber 42. The valve-housing 43 is provided with a valve-stem 45, the upper end wlurcof is provided with a suitable valve 46 llaving a conical taper and adapted to scat ou the valve-seat at the orifice of the chamber in valve-housing 43; namely at tlu` ond of the valve-housing which communicates with the gas-chamber 21. The valve-housing 43 has its inner end preferably thread ed, as shown in Figure 1 and provided with a suitable nut 47 whereby the valve-housing 43 is firmly secured in position in the main or body portion 10; the nut 47 and outer end of valve-housing 43 being shown beveled so as to form gas-tight connections with the casting 10, see Figure 1. The stem of valve 46 is disposed through the valve.- housing and is made fluid-tight by means of a packing nut or sleeve 48, which re- ,ceives the threaded end of the housing 43,

and asuitablepacking-gland 49; the latter being maintained under uniform pressure by means of a spring 50 disposed about the stem 45 within the sleeve 48 and bearing against the wall of the nut 48. A suitable washer is preferably placed on the packinggland`49 to receive the pressure of spring '50. This 'construction maintains a fiuidtight relation between the packing-gland 49 and valve-stem 45.

The inner end of valve-stem 45 is preferably threaded in or otherwise suitably secured in a yoke guide member 51; while the portion of the stem 45 intermediate of nut 48 and yoke member 51 is provided with a suitable compression spring 52 disposed about the stem, with one end taking against the end of nut 48, while the other end engagesl a nut '53 which is screwed onto the threaded end of valve-stem 45 and held in adjusted position by a suitable lock-nut, as at 54. With this construct-ion it is evident that proper pressure may at all times be exerted on the valve 46 so as to normally maintain the latter on its seat. The inner end of valve-stem 45, as previously stated, is preferably threaded into yoke member 51 and the latter is provided with a pin, as at 55, which will prevent a trigger 56 from flying forward when the latter is released. The yoke-member 51 is held loosel in a guide-way formed in the main or bo y portionlO'by means of ablock 57 which is secured in place by a pin 58.

The trigger 56 is pivotally secured at 59 in a suitable manner to the main or body portion 10 and passes through yoke-member 51 as well as through a suitable opening in the outer shell or casing 11; the pivot pin 59 being disposed transversely through the body portion and the outer shell or casing 11 to assist in maintaining-the latter in place. The trigger 56 is provided with a suitable latch 60 pivotally secured on the trigger about the pin 61; the latch-member 60 being controlled by means of a spring 62 which normally tends to force the free end of latch-member 60 into 'engagement with the notches or teeth of a quadrant or locking member 63; the engagement of latching-member 60 with the teeth or quadrant 63 maintainin the trigger 56 in its retracted or adjuste position. The trigger 56 is preferably protected by a suitable guard, as at 64.

VThe acetylene gas or hydrogen is brought into the valve-stem or projection 13 and into the passage 65; its ilow through passage 65 beingcontrolled-by needle-valve 66 shown threaded into the valve-stem 13, see Figure 3; with a gas-tight connection being formed by means o'packing-gland 67 and a suitable nut 68. Upon proper operation of needle-valve 66, by means of handwheel 69, the combustible gas passes through passage 65 to the annular orifice or chamber 27 which is disposed about the mixing tube or throat 26 and the inner end of injector 25. The acetylene or hydrogen is drawn into the mixing tube'or throat 26 through 'the apertures 28 and about the inner tip of injector 25 through the action of the inrushin'g oxygen passing from chamber 21,

through injector 25; and the two gases are then injected into the combining tube or throat 26 from whence they pass into the mixing-chamber 29. The mixed gases, as is evident from the previous description, `will then pass through conduit or tube 30 into passa e 32 of head 31 and thence into annular c amber 33 and be discharged through the multiple of passages 35 disposed in a circumferential manner about the central passage or outlet 36 of nozzle or tip 34. The discharging mixed gases provide the preheating llame when the cutting-tip or nozzle 34 is employed. The cutting lameor oxyrgen jet is produced by opening valve 46. alve 46 may be forced o its seat by. a backward pull on trigger 56, which is thereby brought into engagement with guide-yoke 51y to which valvestem 45 of valve-46 is secured. Thebackward pull of trigger 56 will cause the spring-actuated latch member 60 to engage with the teeth of the quadrant or holding member 63 an'd maintain the trigger, with the valve 46, in its adjusted osition against the action of spring 52. ne opening of valve 46 as just described establishes communication betwen valve-housing 43 and the chamber 21 which is provided with oxygen, thus allowing the oxygen-gas to pass into the valve-housing and through ports 44; into annular chamber 42 which communicates with passage 41, and by means of longitudinally disposed passage 40 (shown in dotted lines in Figure 1) is conveyed into the annular chamber 39. The oxygen gas from chamber 39 is thence conveyed lengthwise of conduit 38'(and therefore about conduit`30 and acting as a cooling medium) to the passage 37 in the head 31 and thence into the centrally -disposed passage 36 in the tip 34. The central portion vof tip 34 has its upper or inner end slightly extended and beveled so as to provide a fluid-tight joint at 70 by reason of in head 31. The outing flame is provided with the valve 46 in the unseated condition shown in Figure 4; while'the blowpipe will merely provide a preheating 'flame when the valve 46 is in the position shown in Figure 1.

Fluid-tight connections between the conduits or tubes 30 and 38 with the main or body portion 10 are provided by proper threaded joints made as shown in the drawing; while suitable gas-tight connection between tube or conduit 38 with the head 31 isalso ei'ected by means of a'suitable silver soldered joint, as at 71.

Our improved blowpipe may be readily converted from a cutting blowpipe into a welding blowpipe by sim 1y removing the l It is, of course, understood that inthe op- `is adapted to screw into the end of head 3l the same as tip 34 and has its inner central end provided with a suitable tapered socket for the rece tion of a conical lug 73, which takes the p ace of the exten ed end of tip 34, previousl described and is adapted t0 form gas-tig t connection with the tapered or conical orice of the passage 37 in the head 31, namely the passage which communicates'with outer tube 38. The tip or nozzle 72 is provided with a single longitudinal passage 74 terminating at its inner end with the radial assages or ports 7 5, disposed about the ug 73 and which communicate with t e annular chamber 33 formed adjacent the ti -receiving'end of head 31 and withV whic passage 32 communicates; the latter assage in turn communicating with the inner concentric tube 30 which receives the combustible mixture of acetylene and oxygen, or other suitable gases, from mixing `chamber 29.

As is evident .from th'e construction shown and described, aside from depending upon valve 46 toy prevent an improper discharge of oxygen into conduitor tube 38, the plug 73 will ensure againstA the passage of oxygen through assage 37 into the tip or nozzle 72; thep ug 73 being firmly forced to its seat by the proper screwing of tip 72 into place.

As is evident from the construction shown and described, especially when the blowpipe is' used as a cutting blowpipe, the oxygen gas which is used for cutting purposes 1s caused to travel lengthwise about the conduit containing the combustible mixture which provides the preheating flame. Causing the oxygen to travel about conduit 30 enables the oxygen gas to be employed as a cooling medium for the mixture passing through conduit 30.

It 1s also evident from the construction shown and described that the injector and combining-tube or throat as well as the oxygen controlling valve, its housing and correlated parts, are' readily accessible vupon o .theremoval of the closure member o r cap 22; and, furthermore, a duid-tight connection for the valvestem 45 is effected by the uniform pressure which may be exerted by j spring 50, which-is controlled and regulated by the positionin of nut 48 on the inner end of the valveousing. Removing pivot pin 59 will allow the tr1 ger 56 to slip out of the yoke-guide 51 and at the same time permit the shell or cover 11 to be slid lengthwise of the conduit or tube 38 and thus enable any desired adjustment being made of the packing or valve-stem.

eration of the blowpipe-as a cutting torch the metal is previously pre-heatedto a suiicient degree by the flame caused by the com? bustible mixture, which passes through tube .in the head communicating 30 and the plurality of ports or passages 35 'in the tip 34; and that after said prethe cutting flame isprovided by a suitab e operation or backward pull of trigger 56v so as to cause valve 46 to move oil its seat and permit a quantity of oxygen to ow past the valve 46 and through the communicating passages to outer tube vor conduit 38 and thence through the central passage 36 of the tip or nozzle 34. In the construction shown and described, the combining and mixing chamber of theblowpipe is provided at a distance removed from the head or nozzle of the blowpipe, namely at a point where it is not apt tov be aiiected by the heat caused during the cutting or welding operation, with the result that a much more reliable and satisfactory blowpipe is produced.

Havin described our invention what We wish to c aim is 1. A blowpip'e of the class described, comprising a handle portion having gas passages and a gas-chamber at the rear end of said handle portion, an injector removably secured in the rear end of said handle portion intermediate of said'gas-chamber and one of said passages, a valve-housing removably secured in said handle portion and arranged in communication with said cham' ber and a second gas "passa e, a spring-oontrolled normally seated va ve arranged Ain Y said housin adapted to control the communication between said chamber and said passage, and pivoted .means extending therein and with a gas-chamber at the rear end thereof, means removably secured in the rear end of said handle portion `whereby mixed gases will be conveyed into one'l of said gas passages, a valve-housing removably7 secured in the handle portion, a valve sli ably mounted in the housing and normally maintained on its seatwhereby communication between said chamber and a second gas passage is controlled, means, operable from the handle exterior, for moving said valve off its seat,.and removable closure means for said as chamber and the rear end of said handige portion.

' 3. In ablowpipe of the class described, the combination of a handle portion comprising a casting having gas passages thereina pair of concentrically arranged conduits or tubes connected at one end to said casting and each communicatin with one of said passages, a

head provide with a' plurality of passagesv and removably connected to the outer end of the concentric conduits, with each passage lwith a separate conduit, -with a tip removab y secured 1n said head, and means disposed at the inner end ing said head to t e handle-portion, the handle-portion consisting of a casting provided with a gas-chamber at the rear end and with j a mixing chamber disposed toward the other or forward end and arranged in communication with one of said tubes or conduits, a removableclosure member for the rear end of the casting, a combined injector and combining tube dis osed intermediate of said gas-chamber and the mixing chamber and removably secured in said castin a valvecontrolled passage intermediate o said gaschamber andthe second tube or outer conduit whereby a single gas is conveyed to said head independently of the mixed gases owing from said mixing-chamber and made to travel lengthwise of the first mentioned or inner conduit to actas a cooling medium.

A blow-pipe, comprising a handle portion provided4 with longitudinal passages and a chamber at the rear end thereof communicating with a as supply, removable closure means for sai rear end of the handle portion, a nozzle or tip-receiving head, concentric gas-conveying tubes or conduits intermediate of the longitudinal passages of 'the handle portion and said head, an injector removably secured in the rear end of said handle portion intermediateof the chamber and one of the longitudinal passages and in communication therewith,. a combining tube removably secured about the forward or tip end of the injector and provided with inlet openings communicatin with a second gas supply whereby a combined mixture is conl veyed to the inner gas-conveying tube, a

spring-controlled valve disposed intermedi* ate of said chamber and a second longitudinal passagewhereby a single gas is conveyed to the outer gas-conveying tube, and means whereby said valve may be forced off its seat.

6. A blowpipe of the classjdescribed, comprising a handle portion provided with' a casting having gas passages and a gas chamber at the rear or outer end of the casting,

- a closure member for the rear end of the casting, one of said gas passages communicatmg with one gas supply while thechamber communicates with a second as supply, a combined injector and combinmg tube removably secured in said casting at the rear end thereof, the injector communicating with said gas chamber while said combining tube communicates with the 1passage communicatin with the gasv supp fy, a spring-controlled valve intermediate o said gas chamber and a second gas passaoe, and a trigger .whereby said spring-controlled valve may be actuated and a single gas permitted to .iiow from said chamber through the second gas passage. n

7 A blow-pipe of the class described, comprising a handle portion consisting of a casting having gas passage and a gas chamber at the outer end thereof, a removable closure member for the outer end of said casting to permit access to said chamber, said chamber having communication with one gas supply While one of said passages communicates with a second gas supply, a tip-receiving head provided with a number of gas passages, a gas-conveying tube or conduit inter- .mediate of one of the gas passages in the casting and one of the passages in said head, a second conduit or tube arranged concentric with the first tube and disposed .intermediateof a second passage in said casting and a second passage in said head, an injector removably secured in said casting intermediate of said chamber and one of said passages, a tubular valve housing removably secured in the rear end of the casting intermediate of said chamber and the second gas passage, a normally seating valve slidably mounted in said valve-housing, means adjustably secured to the inner end of said housing for maintaining a gas-tight relation between the housing and valve-stem disposed therethrough, and means operable from the handle exterior whereby said valve may be forced ofi' its seat and a single gas permitted to flow from the chamber to the second conduit.

8.. A blow-pipe of tac class described, comprising a handle portion consisting of a casting having a pair of longitudinally disposed passages, a gas chamber at the rear end of the casting and ports or passages adapted to eiiect communication with the rear ends of said longitudinally disposed passages, an injector and combining tube removably secured in the casting at the rear end of oneof said longitudinally disposed passages, rsaid injector and combining tube being adapted to rhave communication with said chamber and with some of said ports or passages, respectively, a valve-housing removably secured in the rear end of one of said longitudinally disposed passages whereby communication between said gas chamber and said longitudinally disposed passage may be established .for conveying a single gas therethrough, a spring-controlled valve slidably mounted in said valve-housing for -normally closing oli' communication through movable closure member for said rear end to permit access to said chamber, an injector removably secured in the rear end of the handle portion intermediate of said chamber and one of said passages, said injector being removable through the rear end of the handle portion when said closure member has been removed, a valve-housing removably secured in the handle portion and arranged to have communication with said chamber and a second gas passage, a valve slidably mounted in said valve housing, means adjustabl secured to the valve-stem whereby a regu able pressure on the valve may be exerted and the latter normally held on its seat, and a pivoted trigger extending to thehandle exterior whereby said valve may be forced oil" its seat and a single gas permitted to flow from the gas chamber into the said second gas passage.

10. A blow-pipe of the classdescribed, comprising a handle portion composed of a casting having gas assa es and a gas chamber, an injector an com ining tube removably secured in the rear end of the casting intermediate of the chamber and one of said gas passages, a spring-controlled'valve for controlling the flow of gas from said gas chamber through a second gas passage, a

pair of concentrically arranged conduits, one

of which communicates wlth the gas passage communicating with the injector and combining tube, while the other conduit communicates with the passage controlled by said spring-controlled valve, a head secured to the outer ends of said conduits and having aplurality of passages separately communicating wlth said conduits, in combination with a removable tip or nozzle secured in saidhead, and means controlled by the positioning of the ti passages in said hea may be closed.1

11'. A blow-pipe comprising a handle portion provided with valved inlets and gas passages, one of the assages constituting a mlxing chamber andJ having communication with a valved inlet, a as chamber formed at the rear or outer en of the handle portion, a cap removably secured to the rear end of the member and constituting a closure for said chamber, an injector removably secured intermediate of said chamber and.

said last mentioned passage and intermediwhereby one of the ate of the point of communication between said valved inlet and said assage, a second gas chamber ad'acent the inner or forward end of the han le and arranged concentric with said gas passage, a second gas passage intermediate of the second gas chamber and the chamber at the rear end of the handle, a normally seated valve controlling communication between said second passage and the chamber at the rear end of the handle, and

means whereby saidj last valve may be actuated and a single gas permitted to 4llow from the chamber 'at the rear end of the handle to the second mentioned gas chamber, in combination with a pair of concentric conduits, the inner one communicating with the first mentioned gas passage, while the outer one communicates with said second mentioned gas chamber.

l2. A blow-pipe of the class described, I

comprising a handle portion composed of a casting having longltudinal gas passages and a gas chamber in the rear end thereof a removable closure member for the rear end` of said casting to permit access to said chamber, an injector and combining tube remov-H said housing and provided with a stem dis-` posed through the inner end of thehousing means adjustably secured to the inner en of 'said housing for efecting gas-tight relation between the housing and said valvestem, means adjustably secured to the end of the valve-stem whereby the valve 'is placed under regulable pressure, and a trig-` ger pivotally secured in the handle `portion and in operative relation with ythe valvestem whereby said valve may be controlled from the handle exterior.

WILLIAM J. LEIGHTY. IsArAH ALLIsoN.

Witnesses: y G. HmnMAN, 

